These units are designed for specific contract requirements and would be tailored to the customer’s needs. A two stage axial fan provides high volume at high pressures efficiently. The arrangement of the impellers and motors would be coordinated with the site situation to provide the best solution for the customer.
The concept is a simple one – two fans in series can generate a higher pressure than a single unit at the same volume. Depending on the restrictions of a given site (size and power limitation) the two stage unit may be the best solution for any of the axial family situations.